WO2018011306A2 - Procédé pour produire une impulsion laser et dispositif pour produire un signal de commande pilote - Google Patents

Procédé pour produire une impulsion laser et dispositif pour produire un signal de commande pilote Download PDF

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Publication number
WO2018011306A2
WO2018011306A2 PCT/EP2017/067621 EP2017067621W WO2018011306A2 WO 2018011306 A2 WO2018011306 A2 WO 2018011306A2 EP 2017067621 W EP2017067621 W EP 2017067621W WO 2018011306 A2 WO2018011306 A2 WO 2018011306A2
Authority
WO
WIPO (PCT)
Prior art keywords
laser
compensation signal
time
signal
pulse
Prior art date
Application number
PCT/EP2017/067621
Other languages
German (de)
English (en)
Other versions
WO2018011306A3 (fr
Inventor
Rainer Flaig
Aleksander BUDNICKI
Daniel Glunk
Florian Jansen
Oliver Rapp
Original Assignee
Trumpf Laser Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trumpf Laser Gmbh filed Critical Trumpf Laser Gmbh
Publication of WO2018011306A2 publication Critical patent/WO2018011306A2/fr
Publication of WO2018011306A3 publication Critical patent/WO2018011306A3/fr
Priority to US16/244,608 priority Critical patent/US11444426B2/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
    • H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
    • H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1307—Stabilisation of the phase
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2308—Amplifier arrangements, e.g. MOPA
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor
    • H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
    • H01S5/06216—Pulse modulation or generation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2375—Hybrid lasers

Definitions

  • the invention relates to an arrangement for generating aDeutscheran tenusignals for driving a driver, the one
  • an excitation laser is driven by a driver.
  • the output signal of the excitation laser is amplified by an optical amplifier and then output.
  • Excitation laser and optical amplifier represent a laser. Frequently, such lasers are operated pulsed. However, it happens that the pulse energy of several pulses at the laser output fluctuates despite the same length and the same strong driver drive signals.
  • the object of the present invention is therefore to provide a method and an arrangement with which a predeterminable, in particular a substantially constant, pulse energy can be generated at the output of a laser.
  • This object is achieved according to the invention by a method for generating a laser pulse of an excitation laser in response to a triggering time of a trigger signal, the excitation laser is driven by a driver and thekultureran tenusignal is generated taking into account the time interval of the triggering time or laser pulse to a previous triggering time or laser pulse ,
  • an excitation laser can be used
  • a triggering time is also often referred to as the trigger time.
  • Tripping time to a previous trip time or laser pulse is caused.
  • the time intervals between the triggering times of the trigger signal can vary, which means that the time intervals between the laser pulses can vary. Since the laser pulse of the excitation laser depending on
  • Time interval between the pulses is amplified to different degrees, it can happen that the pulse energy of several pulses at the laser output in spite of the samemaschineeran Kunststoffsignale different levels of failure.
  • the reason for this is that the gain level of the optical amplifier depends on the pumping time between the pulses. The longer you pump, the more energy is extracted. The fact that the time interval of the triggering times or
  • the driver drive signal can be set so that the output of the laser laser pulses are emitted with a constant pulse energy.
  • the activation of the excitation laser can thereby be adapted or scaled. This allows compensation of the gain level in the optical amplifier. In particular, this can be done in
  • the power of the excitation laser can be adjusted.
  • the drive drive signal may be generated in consideration of the characteristics of an optical amplifier driven by the excitation laser. In particular, it can be concluded from the time interval of the triggering times or laser pulses in which state the optical amplifier is located. In particular, it can be concluded that the gain level of the optical amplifier.
  • the driver drive signal can be correspondingly generated so that, taking into account the gain level of the optical amplifier and thus the properties of the optical amplifier laser pulses with predeterminable, in particular constant, energy are generated.
  • the driver drive signal may be generated by compensating a digitally coded pulse shape with a digitally-coded compensation signal.
  • the compensated digitally coded pulse form can be converted into an analog signal.
  • a digitally coded pulse form is read out of a pulse form memory and then into a pulse form memory
  • Analog signal is converted, with which a driver is controlled. If this is done without taking into account the state of the optical amplifier, laser pulses with different signals are produced in the output of the laser
  • the digitally coded pulse shape is already changed with a digitally coded compensation signal in such a way that a driver drive signal is generated before the generation of the analog signal. This can lead to pulses of predeterminable, in particular constant, energy being output at the output of the laser. Since the state of the optical amplifier can depend on the time interval of the triggering times or laser pulses, a suitable coded compensation signal is determined on the basis of the distance of the triggering times or laser pulses.
  • Compensation signal as a function of the time interval of the triggering time or laser pulse of the or a previous triggering time or laser pulse is read out of a compensation signal memory.
  • the driver drive signal is generated by compensating a pulse shape generated from a digitally coded pulse form by digital-to-analog conversion with a compensation signal.
  • the compensation signal from the time interval of the triggering time or laser pulse to a previous
  • a time-dependent factor in the range 0 ⁇ factor ⁇ 1 can be used as a compensation signal. This means that depending on how much Time between the trigger times or laser pulses, the pulse shape is multiplied by a factor between 0 and 1.
  • the compensation signal is reset with a time delay to the triggering time.
  • the compensation signal at the end of the generated pulse shape is reset with a time delay to the triggering time.
  • time-dependent factor can be reduced from 1 to 0, depending on the time. The more time that passes between two triggering times or laser pulses, the more the pulse shape is compensated or corrected.
  • Tripping time or laser pulse is determined and under
  • a driver drive signal for driving a driver that drives an excitation laser having a trigger signal input and a driver signal output.
  • the trigger signal input with a pulse form memory and at least indirectly with a
  • Trigger signal input to a scaling device which are supplied to the pulse shape and the compensation signal and which is adapted to generate amaschineeran tenusignal connected.
  • the trigger signal input can via a delay element with the
  • the compensation signal determination can be a
  • Compensation signal memory include. Depending on the time interval between triggering times may be different
  • Compensation signals are removed from the compensation signal memory and thus a pulse shape can be compensated or corrected. It is also conceivable that only one compensation signal form in
  • Compensation signal memory is stored. It can do that
  • the scaling device may comprise a multiplier. Depending on whether the compensation takes place in the digital range or in the analog range, it can be a digital or analogue
  • the compensation signal detector comprises a particular resettable counter. Furthermore, depending on the counter, a compensation signal from the
  • Compensation signal memory to be read.
  • the resettable counter can be reset in particular at a triggering time. From then on, the counter counts up or down at a predetermined rate. Depending on the counter reading, a compensation signal can be output from the at the next triggering time Compensation signal memory are read out and used to compensate for a pulse shape.
  • a laser system with a laser having an excitation laser, which is driven by a driver wherein an inventive arrangement is provided, which is connected to the driver.
  • FIG. 1 shows a first embodiment of a laser system with a first embodiment of an arrangement for generating a driver drive signal for driving a driver of an excitation laser
  • Fig. 2 shows a second embodiment of a laser system with a second embodiment of an arrangement for generating a driver drive signal for driving a driver of an excitation laser;
  • FIG. 1 shows a laser system 1 with a laser 2, which has a
  • Excitation laser 3 and an optical amplifier 4 has. Of the
  • Excitation laser 3 may be formed, for example, as a seed diode.
  • the excitation laser 3 is driven by a driver 5.
  • Output signal of the excitation laser 3 is by an optical
  • Amplifier 4 which also pump light is supplied, amplified, so that at the output 6 laser light, in particular a laser pulse can be output.
  • an arrangement 7 for generating a laser pulse is provided.
  • the arrangement 7 has a
  • a trigger signal for example, a pulse signal comes into question, wherein the time of occurrence of a rising edge can represent a triggering time.
  • the trigger signal is fed to a pulse form memory 9, which is clocked by a clock source 10.
  • a digitally coded pulse shape is output from the pulse shape memory 9 in time with the clock source 10.
  • the digital-to-analog converter 11 converts the digitally coded pulse form into an analog pulse form.
  • the analog pulse shape is supplied to a scaling device 12. If the analog pulse form directly as
  • Driver drive signal can be used, which supplied to the driver 5 is, so could be output at the output 6 of the laser laser pulses with different energy, since the pulse shape or
  • Energy of the laser pulse from the state of the optical amplifier 4 may depend. Depending on the time interval
  • Amplifier 4 may be different, so too
  • the arrangement 7 has a compensation signal determination 13.
  • the compensation signal determination 13 has a
  • the compensation signal memory 14 is clocked by a clock source 15.
  • Compensation signal determination 13 may further include a digital-to-analog converter 16.
  • the trigger signal from the trigger signal input 8 is the
  • Compensation signal memory 14 supplied with a time delay, which is effected by the delay element 17.
  • a digitally coded compensation signal is output therefrom in time with the clock source 15.
  • the digitally coded compensation signal is transferred to the digital-to-analog converter 16. There, an analog compensation signal is generated.
  • the analog compensation signal is the
  • the scaling device 12 is formed in the embodiment shown as a multiplier, so that there the output from the analog-to-digital converter 11 pulse shape is multiplied by the compensation signal. This results in a time-dependent pulse shape scaling.
  • compensated pulse form at the output of the scaling device 12 or at the driver signal output 18 now represents a driver drive signal, which is supplied to the driver 5.
  • a driver drive signal is generated, which determines the state of the optical amplifier 4
  • the compensation signal which in the
  • Compensation signal memory 14 is advantageously selected depending on the characteristics of the optical amplifier, in particular its gain levels as a function of the pumping time between two pulses.
  • FIG. 2 shows an alternative embodiment of a laser system 100. Elements corresponding to those of Figure 1 are designated by the same reference numeral.
  • An arrangement 107 has a trigger signal input 8. About the trigger signal input 8, a pulse shape memory 9, a trigger signal can be supplied. In time with a clock source 10 is from the
  • Pulseform appointed 9 at a triggering time of the trigger signal output a digitally coded pulse shape.
  • the digitally coded pulse shape is supplied to a scaling device 112.
  • the trigger signal is supplied via a delay element 17 to a compensation signal determination 113.
  • the trigger signal is supplied in particular to a counter 120.
  • the counter 120 is in particular a resettable counter. This resettable counter can always be reset when a trip time occurs and then count up or down depending on the embodiment. According to the count before resetting the counter 120 is from a
  • Compensation signal memory 114 is a digitally coded Compensation signal read out. This digitally coded
  • Compensation signal is supplied to the scaling device 112, so that the digitally encoded pulse shape can be compensated, in particular multiplied, by this signal. That by the
  • Scaling device 112 generated digitally encoded signal, in particular a compensated digitally encoded pulse shape, is a digital-to-analog converter 11, respectively.
  • the digital-to-analog converter 11 can generate an analog signal from this.
  • the analog signal corresponds to one
  • Driver drive signal and can be supplied according to the driver 5 via the driver signal output 118.
  • FIG. 3 shows signal forms for explaining the method according to the invention.
  • a trigger signal is shown, wherein the trigger signal has individual pulses 200, 201, 202.
  • Time offset to the trigger times 203 to 205 are on
  • Output of the delay element 17 pulses 209 to 211 at.
  • Delay element 17 may be chosen so that the rising edge of pulses 209 to 211 coincide with the end 212 to 214 of pulse forms 206 to 208, respectively. According to one embodiment, provision may also be made for the pulses 209 to 211 to be triggered at the end 212 to 214 of the pulse forms 206 to 208.
  • a time-dependent compensation signal 215 to 217 is generated in each case.
  • the compensation signal 225 has been generated. In the illustrated embodiment If the compensation signals are a waveform with a falling line. In each case with a rising edge of one of the pulses 209 to 211, the compensation signal 225, 215, 216, 217 is output with the value 1 and then falls linearly with time.
  • the compensation signals 225, 215, 216 are multiplied by the pulse forms 206 to 208. Since the time interval between the pulses 200 and 201 or 209 and 210 is greater than the time interval between the pulses 201 and 202 or 210 and 211, the pulse shape 207 with a
  • the compensation signal 215 has dropped further than at the beginning of the pulse shape 208, the compensation signal 216 has dropped. Accordingly, the compensation signal 219, which consists of a multiplication of the pulse shape 207 with the
  • Compensation signal 215 has a lower amplitude than the driver drive signal 220, which has resulted from a multiplication of the pulse form 208 with the compensation signal 216. Nevertheless, the laser pulses 221 to 223 have the same shape. The laser pulses 221 to 223 are output at the output 6 (FIGS. 1, 2).

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Lasers (AREA)
  • Laser Surgery Devices (AREA)

Abstract

La présente invention concerne un procédé pour produire une impulsion laser d'un laser d'excitation (3) en réaction à un instant de déclenchement d'un signal de déclenchement, le laser d'excitation (3) étant commandé par un pilote. Selon l'invention, le signal de commande pilote (218 - 220) est produit en prenant en considération l'intervalle de temps entre l'instant de déclenchement et un instant de déclenchement précédent.
PCT/EP2017/067621 2016-07-14 2017-07-12 Procédé pour produire une impulsion laser et dispositif pour produire un signal de commande pilote WO2018011306A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/244,608 US11444426B2 (en) 2016-07-14 2019-01-10 Methods for producing a laser pulse and devices for producing a driver control signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016212928.7A DE102016212928B3 (de) 2016-07-14 2016-07-14 Verfahren zur Erzeugung eines Laserpulses und Anordnung zur Erzeugung eines Treiberansteuersignals
DE102016212928.7 2016-07-14

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US16/244,608 Continuation US11444426B2 (en) 2016-07-14 2019-01-10 Methods for producing a laser pulse and devices for producing a driver control signal

Publications (2)

Publication Number Publication Date
WO2018011306A2 true WO2018011306A2 (fr) 2018-01-18
WO2018011306A3 WO2018011306A3 (fr) 2018-04-19

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US (1) US11444426B2 (fr)
DE (1) DE102016212928B3 (fr)
WO (1) WO2018011306A2 (fr)

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CN109157756B (zh) * 2017-10-30 2020-12-08 武汉奇致激光技术股份有限公司 一种调q激光治疗机的双脉冲激光输出控制方法
CH715767A1 (de) 2019-01-22 2020-07-31 Meridian Ag Treiberelektronik und Verfahren zur Laseransteuerung.
DE102022129873A1 (de) 2022-11-11 2024-05-16 Trumpf Laser Gmbh Laserpulsgenerator und Verfahren zur Erzeugung eines Laserpulses

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Publication number Publication date
US20190148906A1 (en) 2019-05-16
DE102016212928B3 (de) 2017-09-07
US11444426B2 (en) 2022-09-13
WO2018011306A3 (fr) 2018-04-19

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